Andreu Nin and the Poum in the Spanish Revolution. By Andy Durgan (Socialist Worker, Issue 2057, 30 June 2007).
“The revolutionary socialist Andreu Nin resisted fascism and Stalinism during the Spanish Civil War of 1936-9. Nin was murdered by Stalinists 70 years ago this month.”

22 June 1937 – Andres Nin murdered (POUMISTA, June 22, 2010).
“On this day in 1937 in the midst of the Spanish Civil War Andres Nin, a leading member of the Workers Party of Marxist Unity (POUM), was murdered by Stalinists.”

The Spanish Revolution: The life of Andreu Nin. By Wilebaldo Solano (ILP, Leeds, 1974; online at Internet Archive WayBackMachine).
“Andreu Nin was one of the most important figures in the Spanish Revolutionary Marxist movement.”

Farewell to Andres Nin (1937). By Victor Serge (La Revolution Prolétarienne, No. 253, August 25, 1937; online at Marxists Internet Archive).
“Farewell, my friend. Your great courageous life is left to us, full of work and action.”

The historical significance of the POUM. By Wilebaldo Solano (Libcom.org). Translated from the Spanish original in March 2015.
“In this text based on a presentation delivered in 1985 at a conference on the POUM held in Madrid, the former leader of the Iberian Communist Youth, and the last general secretary of the POUM, reviews the history of the POUM …”

The POUM: Those who would? By Doug Enaa Greene (Links: Journal of Socialist Renewal, January 7, 2015). With video talk (1:25:31 min.).
“Thus the central tragedy of the Spanish Civil War is that the anarchists possessed the numbers and organizational muscle for power, but refused to take it. The POUM had a program for waging revolutionary war, but lacked the mass influence, allies and the leadership needed to win.”

Wilebaldo Solano, 1916-2010. By J. Martorell (Against the Current, No. 152, May-June 2011).
“Wilebaldo Solano, the last member of the original leadership of the Partit Obrer d’Unificació Marxista (POUM – Workers’ Party of Marxist Unification), died in Barcelona on September 7, 2010, at 94.” See also Suzi Weissman: Wilebaldo Solano as I knew him (ibid.).

The POUM’s seven decades. By Wilebaldo Solano (Against the Current, No. 143, November-December 2009).
“The Partido Obrero de Unificacion Marxista was founded in Barcelona on September 30, 1935 … It is universally known that POUM was one of the forces that actively intervened in the fight against the fascist-military insurrection in Catalonia, Valencia, Madrid, Asturias and elsewhere.”

International volunteers in the POUM Militias. By Andy Durgan (Libcom.org, December 23, 2007).
“Up to 700 foreigners fought with the 10.000 or so militia organised by the Partido Obrero de Unificación Marxista (POUM) between July 1936 and June 1937.”

Marxism, war and revolution: Trotsky and the POUM. By Andy Durgan (Revolutionary History, Vol. 9, No. 2, 2006, p.27-65; online at Internet Archive Way Back Machine).
“For Trotsky, however, the principal lesson of the Spanish revolution was the need for a revolutionary party. Not surprisingly therefore, much of what he wrote during and after the Civil War concerned the errors of those who considered themselves revolutionary Marxists.” In Swedish: Marxism, krig och revolution: Trotskij och POUM (pdf) (Marxistarkiv.se).

Trotskyists and the POUM (Trotskyist International, No. 18, October-December 1995).
“Keith Harvey explains the politics of the POUM. Their opposition to Stalinism made them the first victims as Stalinism beheaded the Spanish Revolution.”

The Spanish Trotskyists and the foundation of the POUM. By Andy Durgan (Revolutionary History, Vol. 4, No. 1-2, Winter 1991-92, p.11-53; online at Marxists Internet Archive).
“In September 1935 the Spanish Trotskyist group, the Communist Left (ICE), fused with the Workers and Peasants Bloc to form the POUM … Whilst the political development of the POUM, or at least Trotsky’s criticisms of it, are relatively well known [1], the history of the Spanish Trotskyists and their reasons for helping to found this party are far less know.” Se også svensk udgave: De spanska trotskisterna och grundandet av POUM (pdf) (Marxistarkiv.se).

Stalinism and the POUM in the Spanish Revolution (1937). By Walter Held (Revolutionary History, Vol. 1, No. 2, Summer 1988, p.11-17; online at Marxists Internet Archive).
“The POUM took a position for the Socialist Revolution against the democratic parliamentary republic (without however, as we will show, posing the necessary practical consequences of this) and this, most honourably, brought upon it the hatred of the scab Executive of Moscow.”

Trotsky and the POUM. By Keith Hassell (Revolutionary History, Vol. 1, No. 2, Summer 1988, p.18-19; online at Marxists Internet Archive).
“Despite Trotsky’s trenchant criticism of the political parties in the workers’ camp in Spain there were few people in Spain who were listening to him.”

How the NKVD framed the POUM (1953). By Jesus Hernández (What Next?: Marxist Discussion Journal, 1996). With introduction by Robert Pitt.
“This account of the POUM’s suppression in 1937 is taken from the memoirs of Jesus Hernández, published in 1953 in Mexico and in a French version as La Grande Trahison (The Great Betrayal).

The P.O.U.M. in Spain. By Albert Weisbord (Class Struggle, Vol. 7, No. 1-2, February 1937).
“Many advanced workers, disillusioned with the Socialists and Stalinists, have been willing to believe that in the P.O.U.M. there is some hope that the workers will be able to surmount their difficulties and establish the dictatorship of the proletariat and a socialist regime.”